[xml] xmlSaveFormatFile not always formatting

[Connor Behan <connor behan gmail com>]

My favourite way to format xml is to have indentations and newlines so I 
though xmlSaveFormatFile would be the best function for me to use. It 
outputs xml this way when the xml node it's saving is a newly created 
one with xmlNewDoc... however if I open an existing xml file with 
xmlParseFile and add anything to that node, calling xmlSaveFormat file 
will add the new stuff all on one line.

Here is a test case which demonstrates this behaviour: 
http://pastebin.com/m41938b74 Could someone explain to me why this is 
happening and if possible, suggest an alternative method (besides the 
obvious hacks of "remaking" a hierarchy in memory, node by node or 
manually inserting '\n' and '\t'). Thanks alot.